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首页> 外文期刊>Advanced Functional Materials >A High-Performance Binary Ni-Co Hydroxide-based Water Oxidation Electrode with Three-Dimensional Coaxial Nanotube Array Structure
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A High-Performance Binary Ni-Co Hydroxide-based Water Oxidation Electrode with Three-Dimensional Coaxial Nanotube Array Structure

机译：三维同轴纳米管阵列结构的高性能二元Ni-Co氢氧化物基水氧化电极

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摘要

Developing nanostructured Ni and Co oxides with a small overpotential and fast kinetics of the oxygen evolution reaction (OER) have drawn considerable attention recently because their theoretically high efficiency, high abundance, low cost, and environmental benignity in comparison with precious metal oxides, such as RuO_2 and IrO_2. However, how to increase the specific activity area and improve their poor intrinsic conductivity is still challenging, which significantly limits the overall OER rate and largely prevent their utilization. Thus, developing effective OER electrocatalysts with abundant active sites and high electrical conductivity still remains urgent. In this work, a scrupulous design of OER electrode with a unique sandwich-like coaxial structure of the three-dimensional Ni[Ni~((2+/3+))Co_2(OH)_(6-7)]_x nanotube arrays (3D NNCNTAs) is reported. A Ni nanotube array with open end is homogeneous coated with Ni and Co co-hydroxide nanosheets ([Ni~((2+/3+))Co_2(OH)_(6-7)]_x) and is employed as multifunctional interlayer to provide a large surface area and fast electron transport and support the outermost [Ni~((2+/3+))Co_2(OH)_(6-7)]_x layer. The remarkable features of high surface area, enhanced electron transport, and synergistic effects have greatly assured excellent OER activity with a small overpotential of 0.46 V at the current density of 10 mA cm~(-2) and high stability.
机译：近来开发具有较小的过电位和快速的氧释放反应动力学（OER）的纳米结构的Ni和Co氧化物引起了人们的广泛关注，因为与贵金属氧化物（例如RuO_2和IrO_2。但是，如何增加比活面积并改善其较差的固有电导率仍然是一个挑战，这显着限制了整体OER率并在很大程度上阻碍了它们的利用。因此，开发具有丰富活性位点和高电导率的有效OER电催化剂仍然是紧迫的。在这项工作中，精心设计的OER电极具有三维Ni [Ni〜（（2 + / 3 +））Co_2（OH）_（6-7）] _ x纳米管阵列的独特三明治状同轴结构（3D NNCNTAs）被报告。带有开口端的Ni纳米管阵列均匀地涂有Ni和Co氢氧化钠纳米片（[Ni〜（（2 + / 3 +））Co_2（OH）_（6-7）] _ x）并用作多功能中间层以提供大的表面积和快速的电子传输，并支持最外层的[Ni〜（（2 + / 3 +））Co_2（OH）_（6-7）] _ x层。高表面积，增强的电子传输和协同效应的显着特征极大地确保了优异的OER活性，在10 mA cm〜（-2）的电流密度下具有0.46 V的小过电位，并具有很高的稳定性。

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  • 来源
    《Advanced Functional Materials》 |2014年第29期|4698-4705|共8页
  • 作者

    Zhenlu Zhao; Haoxi Wu; Haili He; Xiaolong Xu; Yongdong Jin;

  • 作者单位

    State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, Jilin, P. R. China,University of Chinese Academy of Sciences Beijing 100039, P. R. China;

    State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, Jilin, P. R. China,University of Chinese Academy of Sciences Beijing 100039, P. R. China;

    State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, Jilin, P. R. China,University of Chinese Academy of Sciences Beijing 100039, P. R. China;

    State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, Jilin, P. R. China;

    State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022, Jilin, P. R. China;

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